The standard divides airspace into seven categories, namely categories A, B, C, D, E, F, and G.

1) Category A only allows IFR flights, all aircraft are equipped with intervals, provide ATC services, require ground-to-air two-way communication, and ATC permission is required to enter the airspace;

2) Category B allows IFR and VFR flights, and the others are the same as Category A;

3) Category C only requires separation between IFR flights and between IFR and VFR flights. ATC services are provided between IFR flights, and the others are the same as B;

4) Category D only requires separation between IFR flights, ATC services are provided between IFR flights, and flight information services are provided for VFR flights. The others are the same as C. ;

5) Category E only requires IFr flights to achieve two-way ground-to-air communication. VFR flights do not require ATC permission to enter the airspace. Others are the same as D;

6) Category F airspace is suitable for IFR flights. Provide traffic information and intelligence services, and VFR flights provide flight information services. All aircraft do not need ATC permission to enter the airspace, and the others are the same as E;

7) Class G airspace does not need to provide separation services, and provides flight For intelligence services, only IFR flights are required to achieve two-way ground-to-air communication. ATC permission is not required to enter the airspace. Others are the same as F.

Extended information:

Restricted area: It is a type of airspace with higher restrictions and restrictions than dangerous areas and lower than restricted areas. Flying in this airspace is not an absolute restricted area, but Whether there is danger or not can no longer just depend on the pilot's own judgment and speculation. The establishment of this type of airspace is generally not long-term, so the most important thing is to let relevant parties know when the area will come into effect, when it will cease to exist, and whether the conditions and reasons for its establishment are still there.

Activities often related to the establishment include aerial ranges, high-energy laser tests, and missile tests. Some restricted areas are effective for 24 hours, some only affect certain periods, and other periods have no effect on flights. Impact, the US FAA stipulates that once the restricted area takes effect, the relevant control agencies should be notified, and only then can the official ATC airport issue permission to direct IFR flights away from the area.

VFR flights can obtain navigation assistance from ATC, but pilots must maintain their own distance from the restricted area. Once the restricted area is no longer in effect, the relevant management agency should notify the ATC unit before proceeding. IFR and VFR flights are allowed within this area, and the area can be marked with the letter R on VFR and IFR charts.

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